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Global Warming and Soil Microclimate: Results from a Meadow‐Warming Experiment
Author(s) -
Harte John,
Torn Margaret S.,
Chang Fang-Ru,
Feifarek Brian,
Kinzig Ann P.,
Shaw Rebecca,
Shen Karin
Publication year - 1995
Publication title -
ecological applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.864
H-Index - 213
eISSN - 1939-5582
pISSN - 1051-0761
DOI - 10.2307/1942058
Subject(s) - microclimate , environmental science , vegetation (pathology) , snowmelt , alpine climate , global warming , atmospheric sciences , growing season , montane ecology , hydrology (agriculture) , water content , climate change , ecology , surface runoff , biology , geology , medicine , geotechnical engineering , pathology
We used overhead infrared radiators to add a constant increment of °15 W/m 2 , over 2 yr, to the downward heat flux on five 30‐m 2 montane meadow plots in Gunnison County, Colorado, USA. Heating advanced snowmelt by °1 wk, increased summer soil temperatures by up to 3°C, and reduced summer soil moisture levels by up to 25% compared to control plots. Soil microclimate response to heating varied with season, time of day, weather conditions, and location along the microclimate and vegetation gradient within each plot, with the largest temperature increase observed in daytime and in the drier, more sparsely vegetated zone of each plot. Day‐to‐day variation in the daily‐averaged temperature response to heating in the drier zone was negatively correlated with that in the wetter zone. Our experimental manipulation provides a novel and effective method for investigating feedback processes linking climate, soil, and vegetation.